Witty, and full of wisdom. The first one is a famous quote from Japan. A similar one on a bridge in Fatehpur Sikri, near the Taj Mahal: “Not allowed to stay on this bridge”. , symbolising the temporary nature of our life in this world. No one is here to stay for good. At the bus stop, on the bridge or on this earth, we are but travellers, and have to leave everything behind to be eligible for the next leg on this eternal journey.

Actually you should classify these jokes/one-liners/comments/quotes. Quite a few are non-serious jokes; quite a few are harmless jokes; and quite a few are serious ones. Mixing them all up is taking away their sanctity.